Computer Repair-Business Thoughts

I have thought about doing part-time work as a Computer Technician and I have also wondered what all is necessary to start a computer repair business and what to avoid.

Some of these forums will give a good insight into preparation and what to expect.
http://www.dslreports.com/forum/r21686763-ATT-ConnecTech-Jobs
http://www.techexams.net/forums/jobs-degrees/40343-starting-computer-repair-business.html

There was talk of OnForce. Apparently they are the company that AT&T's ConnecTech uses. This is the OnForce link for their Service Pro Help Topics.
http://help.onforce.com/pros/

This is an opinionatetd article against working with OnForce. http://www.ripoffreport.com/reports/0/232/RipOff0232335.htm